1. A. P. Gulyaev and E. A. Ul'yanin, MiTOM, No. 8 (1963).
2. B. B. Gulyaev, I. A. Shapranov, et al., Coll: Rare-Earth Elements in Steels and Alloys [in Russian], Metallurgizdat (1959).
3. A. S. Kreshchanovskii and M. F. Sidorenko, Liteinoe proizvodstvo, No. 11 (1961).
4. Ya. E. Gol'dshtein, Microalloying of Steel and Cast Iron [in Russian], Mashgiz (1959).
5. V. I. Yavoiskii, P. A. Metevosyan, et al., Stal', No. 5 (1963).